Treasure Island

Treasure Island (called Treasure Hunt occasionally) is the fourth unlockable minigame in Sonic Battle and is unlocked by beating Amy's episode in Story Mode.

Gameplay

Comparatively, this minigame plays the most similar to the main game. Players are given a standard 2.5D map and must look for the most hidden treasure (out of three) in time, before one another. This minigame is only playable in multiplayer mode, across up to four different Game Boy Advance devices.